Our Team

We are an advocate for the patient, a translator for their families and a partner to the provider.

Founder and Chief Executive Officer

Sikirat Iyabo Tinubu-Karch, MD MHA

Dr. T-K has been a practicing physician specializing in internal, hospital and geriatric medicine at The Polyclinic, Swedish Medical Center, University of Washington and the Department of Veterans Affairs, Puget Sound in Seattle, WA. She holds additional sub-specialty training in Critical Care Medicine and a master’s degree in Health Administration from the University of Washington. She is passionate about technology and its growing applications in clinical medicine and is certified in Health Information Technology.

Stephen Krause

Behavioral Health Director

Sheri Waller, LICSW

Sheri Waller completed her Undergraduate and Graduate studies at the University of Washington. She studied Communications and German Language and Literature, along with a master’s in Social Work. Sheri began her Social Work career in the Geriatric Psychiatry unit at Auburn Regional Medical Center. She went on to work at Snoqualmie Valley Hospital, in the Geriatric Psychiatry unit and Swing Bed program. Sheri is a Licensed Independent Clinical Social Worker, which allows her to practice as an Independent Mental Health Clinician. Sheri served as Social Work Manager at Snoqualmie Valley Hospital; Area Manager and Interim Director of Social Work, Case Management and Utilization Management for St. Luke’s Health; and Social Work Manager at Good Samaritan Hospital in Puyallup, WA. Sheri has provided therapeutic counseling services to patients admitted to the hospital, those in outpatient settings and via Telehealth.
Geriatric Psychiatrist

Hisam Goueli, MD

Hisam Goueli is passionate about caring for older adults and helping them age with dignity. He completed a combined Family Medicine and Psychiatry residency at the University Hospitals of Cleveland - Case Western University in Cleveland, Ohio with additional qualifications in Global Health. He has served as the Medical Director for the Inpatient Geriatric Psychiatry and Neuropsychiatry unit at Emory University, Medical Director for Electroconvulsive and Somatic Therapies at the University of Washington and the Adult Inpatient Division Director for Adult Psychiatry at South Oaks Hospital. He specializes in psychiatric issues that impact older adults, a regional expert in Electroconvulsive Therapy and excels in helping patients and their families understand their diagnosis and treatment options.

Outside of practicing medicine, Dr. Hisam Goueli is an advocate for political change and wants to shape laws to best serve patients. Frustrated by the political and economic limitations he faced, Dr. H. Goueli ran for Seattle City Council in 2017 to create a city-wide healthcare platform and subsequently created a PAC called Doctors in Politics to inspire doctors from around the country to pursue political careers and change how we practice healthcare for the betterment of patients.

Ebrima Fatajo, ARNP

Ebrima Fatajo is a Nurse Practitioner Specialist at 6M Geriatrics. He graduated from the University of Washington, Seattle in 2018 with a doctorate in Nursing Practice. Ebrima specializes in geriatric and internal medicine. He enjoys the unique stories and life trajectories of each of his patients as he works with them to manage their complex medical issues.
Ebrima enjoys reading, jogging, play soccer and basketball outside of work.
Medical Director

Damilola Oluyitan, MD MHMS

Dr. Lola is a board certified family medicine physician. Her personal philosophy, is treating her patients like family.

Dr. Lola was born in Nigeria, but grew up in Maryland and Ohio. She come from a fairly large family, and understand the importance of compassion, communication, and empathy. She obtained a BS from Fisk University in Nashville TN. She continued to earn a master’s in health management systems from Duquesne University in Pittsburgh PA. She later went on to earn my medical degree from Ross University School of Medicine. She completed my internship and residency at Grant medical center in Columbus OH, at an esteemed inpatient family medicine program.

Dr. Lola joined 6M Geriatrics, not only for the mission, but because of the population we are serving. Our aging population has spent years giving to their families, jobs, communities, organizations, etc. It is now time for us as a societies, including their healthcare team, to meticulously give back to them. She has a passion for geriatrics, mental health, and doing what’s right for every patient, every time.

She currently reside in north Seattle with my husband and growing family. In her spare time, Dr. Lola love to read, travel, and act in the capacity of food critic (when dining out was a part of our leisure activities).

Debby Martin, ARNP, GNP

Advanced Registered Nurse Practitioner Debby Martin is a graduate of Seattle University, where she earned her Master in Nursing.
She is board certified as an Advanced Registered Nurse Practitioner, as well as a Geriatric Nurse Practitioner.
In her spare time, Ms. Martin teaches horseback riding lessons and trains horses. She owns a farm and table so she keeps herself busy with projects around the farm and stable.

Dawda Cham, ARNP

Dawda Cham is a Nurse Practitioner Specialist in Washington. He graduated from the University of Washington School of Nursing in 2018. Having more than 2 years of diverse experiences, especially in Nurse Practitioner.

Dawda Cham, BSN, D.N.P, A.R.N.P, is a Doctor of Nursing Practice and a Board-Certified Adult-Gerontology Nurse Practitioner.

He is fascinated in helping the sick and the needy. As a result, Dawda has dedicated more than 17 years in both acute and long-term care settings with focus interest in geriatrics and adult primary care.

Dawda did both his undergraduate and doctoral programs from the University of Washington where he graduated with a Doctor of Nursing Practice in 2018. He enjoys helping the sick and the needy. His interest has been working with the underserved and homeless communities. In light of that, he did his capstone project on evaluating a Conditional Cash Transfer Project for Congolese Refugees in the South King County of Seattle.

Dawda enjoys spending time with family. At his leisure time, he plays soccer. Of late, Dawda has been fascinated and watching basketball and football. He also finds hiking exciting and healthy.

Physician's Assistant

Mahmood Kakar, PA

Physician Assistant Mahmood Kakar is a graduate of the University of Washington in Seattle 1992 where he earned his undergraduate degree as a physician assistant in the pa program – medics northwest. Kakar went on to earn his masters in health administration in 1995. His fields of interest are ER, primary practice and internal medicine.

Outside of work, Mahmood enjoys hiking and is an avid volleyball player, playing 3 to 5 times per week.

Vice President of Operations

Jackson Owen

Jackson Owen is a seasoned healthcare executive with over ten years of post-acute leadership. He began his career in health care with one of the largest post-acute providers in the country and has been a licensed Nursing Home Administrator since 2012. He graduated cum laude from Utah Valley University in Hospital administration and earned his Master of Business and Health Administration from Western Governors University.
Director of Operations and Revenue Cycle

Kim Magness

Kim Magness has been a leader in Medical Practice Operations and Revenue Cycle Management for over 20 years, working in neurology, acute care, specialty surgery, and most recently in home based primary care for the seriously ill elder population. Prior to moving into administrative leader roles, she worked as a Radiologic Technologist, specializing in Diagnostic and Interventional Radiology in inpatient and outpatient settings.

Kim became a Certified Professional Coder in 1996 and she has used that expertise to teach Physicians, Nurse Practitioners, and Physician Assistants how to document and code to meet payor compliance requirements and optimize organizational revenue. She has also acted as mentor for new Coders as part of the AAPC’s Project XTern, providing guidance and support for new graduates. She enjoys mentoring younger team members, providing coaching and development opportunities for them to grow in their professional roles.

Kim lives in Portland with my husband and the youngest two of our four children, and our two dogs, Greta and Riley. In her spare time, she loves to read and cook.

James Lin, MD

Dr. James Lin is a geriatrician at 6M Geriatrics.
Dr. Lin specializes in the unique health needs of the elderly, including chronic diseases, nutritional problems, skin ailments, cognitive loss, memory impairment, adverse affects of medications, immobility and balances issues.
Practice Administrator

Aery Yoo

Aery Yoo is a Scribe at 6M Geriatrics. Aery graduated from the University of Washington Seattle, School of Aquatic Fishery Sciences. Aery’s passion is in the emergency medicine side of things. In her spare time, Aery likes to go for walks, and shop treats and toys for her puppy.
Marketing Specialist

Ngozi Musa

Ngozi Musa is a Marketing Specialist at 6M Geriatrics. Ngozi graduated from Harvard University in 2019 with a degree in Sociology and minor in African American Studies. Ngozi’s fields of interest are in medical sociology and understanding the patient from that lens.

In her spare time, Ngozi enjoys working out, doing charity work, and spending time with her family and friends.

Data analyst and Executive Assistant

Claire Tinubu-Karch

Claire Tinubu-Karch is a Data Analyst and Executive Assistant at 6M Geriatrics. Claire graduated from the University of Washington Seattle earning a degree in medical anthropology and global health, with a international studies minor. In her spare time, Claire likes to cook, exercise, do charity work, hike, and go camping.
Medical Director

Katherine Min, MD

I grew up in Seattle, attending Lake City Elementary and Whitman Junior High. Then, I went East to attend Boston University for her BA, MA in Biology then lived in New York City for a Gap year. I completed my medical schooling with George Washington University in Washington DC and then, residency in Medicine Pediatrics with University of Illinois. I returned to Seattle and have been working with Swedish (formerly Stevens Hospital) in Edmonds as a Hospitalist, acute medical care division.

I joined 6M Geriatrics Team as our mission to care for patients in a continuum in the various phases in one’s life was very important to me. The fragmentation of medical care, i.e. being cared for by so many doctors in all different settings or even in the same clinic did not make sense. Building relationship with my patients and families, providing a piece of mind that I will be there for you each step of your medical care in all healthcare settings is the WHY I joined 6M Geriatrics. And delivering the service that really matters to our patients and families is what matters to me as a physician.

In my spare time, I volunteer for my 2 daughters’ PTSA Cultural Fair, Girl Scouts, and Korean-American School. We enjoy adventure travels to places like Patagonia. This year, we have found great local hikes like Mailbox Peak and Snow Lake.